<?php
$root = realpath($_SERVER["DOCUMENT_ROOT"]) . "/SmartTuition/SmartTuition.Model"; 
// including base class, Entity
require_once("$root/Models/Base/Entity.php");

class EntityWithID extends Entity
{
    private $id;

    function __construct($id) {
        $this->id = $id;
    }

    public function getId() {
        return $this->id;
    }

    public function getValues(){
        $str = "";
        return $str;
    }
}